Spray gun



June 10, 1930. w. F. GRADOLPH SPRAY GUN Filed Feb. 28, 1929 Patented June 10, 1930 UNITED STATES PATENT OFFICE WILLIAM I. GRADOLPH, OF TOLEDO, OHIO, ASSIGNOR TO THE DE VILIBISS COMPANY,

OF TOLEDO, OHIO, A CORPORATION OF OHIO SPRAY GUN Application filed February 28, 1929. Serial No. 343,396.

This invention relates primarily to a spray gun, with special reference to the ad ustment of the direction in which the nozzle is pointed.

In using a spray gun for various pur poses, as for example, in 011 service stations, it frequently becomes necessary to spray parts which can conveniently be reached only by means of a nozzle having a curved neck extending in one direction or another from the body of the gun. For this reason, it has heretofore been customary, in completely equipped service stations, to provide a number of spray guns having nozzles curved in different directions, according to the particular purpose for which each gun is designed. I

lVith the above considerations in mlnd, it is an object of the present invention to provide a spray gun of simple and practical construction, in which the nozzle may be. adjusted in any direction desired, so that a single gun may be used for various purposes, where several different guns have heretofore been required.

The essential features of my invention,

and the advantagesresulting therefrom, will be more particularly explained 1n connection with the accompanying drawings, in which:

Figure 1 is a longitudinal sectional view of the invention as embodied in a spray gun.

Figure 2 is an enlarged sectional View taken on the line 2-2 of Figure 1. l

The invention, in the form shown in the drawings, is embodied in a spray gun having a body portion 5 formed with a screw threaded cap 6 or other attaching means adapted to be secured to a receptacle 7 containing the oil or other liquid to be sprayed. The body portion 5 is preferably formed with a handle 8 having a passageway therethrough adapted to be connected with a source of compressed air which is controlled by a valve 10.

It is, of course, understood that in spraying devices of this kind, a flow of liquid from the receptacle is customarily induced by suction created by the flow of compressed air through the nozzle. The spraying device is therefore provided with two substantially concentric passageways, and the compressed air may be forced through either the inner or the outer passageway while the liquid is drawn through the other passageway. In the present instance, the air from the passageway 9 passes through a tube 11 securely connected therewith and thence through an innerpassageway 12 which is securely connected to the end of the tube 11 by means of a suitable coupling 13. The body 5 is formed with a chamber 14 encompassing the tube 11 and having an inlet port 15, to which is connected a liquid tube 16 leading from a point near the bottom of the receptacle 7. Surrounding the air conduit 12 is a tube 17 somewhat larger in diameter than the inner conduit and connected with the chamber 14. The outlet end of the tube 17 has a nozzle 18 connected therewith and co-operating with the nozzle 24 connected with the air conduit 12, to form a spray head. The inner nozzle 24: may be formed with ribs 19 seated within the nozzle 18,

or any other suitable means may be used for maintaining the concentric relation between the streams of air and liquid as they approach the outlet 20 of the spray head.

The inner conduit 12 is flexible and may be made similar to BX tubing, or it may be plain tubing made from lead or other soft material. The outer conduit 17 is made from comparatively stiff material and is curved near its outlet end so that the spray head is directed at an angle with relation to the body of the gun. The inlet end of the tubing 17 has a swivel connection with the body 5 so that it may be readily adjusted in any direction. This swivel connection comprises a flanged rib 21 welded or soldered to the tube and engaged by a union member 22, which secures the tube firmly in any position to which it is adjusted.

In order that the inner conduit 12 may be securely connected to the tube 11, and may be allowed to bend in any direction according to the adjustment of the tube 17, and in order also that there may be no likelihood of the flexible conduit 12 becoming twisted by reason of a frictional engagement with the inner surface of the tube 17, the conduit 12 is wrapped in a casing of braided or interlaced flat wire as shown at 23, with the strands running helically about the same. Such a wrapping is quite flexible, yet any torsional force exerted against the same, by reason of the swivel adjustment of the outer tube 17 is in the direction of the length of the helically arranged wire strands. These strands, therefore, effectively prevent the twisting of the casing and consequently prevent the twisting of the inner conduit. Thus provision is made for adjusting the spray head at any angle about the axis of the body 5, without any possi bility of damage to the inner tubing.

While I have shown and described the specific construction of the invention in the form which is at present preferred, it is obvious that the same may be adapted for use in other ways without departing materially from the essential features thereof. It is my purpose, therefore, to include all such modifications within the scope of the appended claims.

What I claim is:

1. In a spraying device, a body with inner and outer conduits connected thereto, the inner conduit being flexible, the outer conduit being stiff, with the end remote from the body curved laterally, said outer conduit enclosing the inner conduit and being rotatably adjustable about the longitudinal axis of its connection with said body, a spray head connected to the discharge end of said conduits, and a protective casing between the outer and inner conduits and having a portion secured to the inner conduit to prevent torsional displacement of the latter when the outer conduit is adjusted.

2. In a spraying device, a body with inner and outer conduits connected thereto, the inner conduit being flexible, the outer conduit being stiff, with the end remote from the body curved laterally, 'said outer conduit enclosing the inner conduit and being rotatably adjustable about the longitudinal axis of its connection with said body, a spray head connected to the discharge end of said conduits, and a casing about said inner conduit inside-of the outer conduit, said casing comprising diagonally crossing flexible strands.

3. In a spraying device, a body having inner and outer passageways therethrough, a flexible conduit with its inlet end secured to the body to constitute a continuation of said inner passageway, a stiff curved conduit encompassing the flexible conduit and having a circumferentially adjustable connection with the body to constitute a continuation of said outer passageway, a spray head connected to the discharge end of said conduits, and a protective flexible casing mounted between the outer and inner conduits with a portion secured to the inner conduit, said casing comprising diagonally I inner and outer passageways therethrough,

a flexible conduit with its inlet end secured to the body to constitute a continuation of said inner passageway, a stiff curved eonduit encompassing the flexible conduit and having a circumferentially adjustable connection with the body to constitute a continuation of said outer passageway, a spray head connected to the discharge end of said conduits, and a casing secured outside of said inner conduit and within the outer conduit, said casing comprising diagonally crossing interlaced flexible strands.

5. In combination, an outer conduit of comparatively stiff material, an inner flexible conduit extending through said outer conduit, a portion of the outer conduit through which the inner conduit extends being curved, means for securing the inlet end of the inner conduit, the outer conduit being circumferentially adjustable with reference to the inner conduit, and a protective covering for the inner conduit within the outer conduit, and constructed to resist torsional strain and prevent the inner conduit from twisting.

6.. In combination, an outer conduit of comparatively ,stiif material and curved so that its outlet is at an angle to its main axis, an inner flexible conduit extending through said outer conduit, means for securing the inlet end of the inner conduit, the outer conduit being circumferentially adjustable about its main axis, and a casing enclosing the inner conduit and contained within the outer conduit, saidcasing being composed of helical strands extending about the inner conduit at opposite angles and crossing each other.

7. In combination, an outer conduit of comparatively stiff material and curved so that its outlet end is at an angle to its inlet end, an inner flexible conduit extending through said outer conduit, means for securing the inlet end of the inner conduit, a swivel connection for the adjacent end of the outer conduit, means for securing said swivel connection in any desired circumferential position, and a casing enclosing the inner conduit within the outer conduit, said casing being composed of interlaced, helically disposed, flat metallic strands, whereby to prevent torsional strain being imparted to the inner flexible conduit, when the outer conduit is adjusted circumferentially.

In testimony whereof I have hereunto signed my name to this specification.

WILLIAM F. GRADOLPH. 

